What disease killed most people in 1883?

The Deadliest Outbreak of 1883

Stepping back to the late 19th century, humanity was still locked in a fierce battle against microscopic enemies that modern medicine has now largely pushed to the history books. In 1883, the disease responsible for taking the highest toll of human lives was smallpox.

Caused by the variola virus—a formidable member of the orthopoxvirus family—smallpox was an acute, highly contagious illness that spared virtually no corner of the globe. For generations, it stood out as one of the most terrifying and devastating scourges known to civilization, claiming millions of lives over the centuries.

The defining tragedy of smallpox was its relentless nature, spreading easily from person to person and leaving survivors with severe, lifelong scars. Yet, the story of smallpox ultimately turned from one of despair to one of human triumph. Through global vaccination efforts pioneered by Edward Jenner's early breakthroughs and driven forward by international cooperation, the disease was systematically cornered.

Today, smallpox holds a unique place in medical history: it remains the first and only human infectious disease to be completely and successfully eradicated through concerted public health action, a monumental milestone achieved in 1980 that closed the chapter on one of history's deadliest killers.